JavaScriptExecutor in Selenium WebDriver with Example (medium)
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Questions and Answers

Which interface in Selenium Webdriver helps to execute JavaScript?

  • Webdriver
  • Selenium
  • JavaScriptExecutor (correct)
  • WebDriver

    • What are the two methods provided by JavaScriptExecutor to run JavaScript?

  • sendKeys and click
  • findElement and getText
  • getAttribute and submit
  • executeScript and executeAsyncScript (correct)

    • When would you use JavaScriptExecutor in Selenium Webdriver?

  • When you want to import an extra plugin or add-on
  • When locators like XPath and CSS do not work (correct)
  • When you want to perform operations on a web page
  • When you want to write a test case

    • Which package needs to be imported to use JavaScriptExecutor?

    <p>org.openqa.selenium.JavascriptExecutor</p> Signup and view all the answers

    What does the executeScript method do in JavaScriptExecutor?

    <p>Executes JavaScript in the currently selected frame or window</p> Signup and view all the answers

    What type of function does the script used in the executeScript method run as?

    <p>Anonymous function</p> Signup and view all the answers

    Can the executeScript method in JavaScriptExecutor return values?

    <p>Yes</p> Signup and view all the answers

    What does JavaScriptExecutor allow you to do on a web element?

    <p>Identify and perform operations</p> Signup and view all the answers

    Which locators are commonly used in Selenium Webdriver?

    <p>XPath and CSS</p> Signup and view all the answers

    Do you need an extra plugin or add-on to use JavaScriptExecutor in Selenium Webdriver?

    <p>No</p> Signup and view all the answers

    Which package needs to be imported to use the JavascriptExecutor interface in Selenium?

    <p>org.openqa.selenium.JavascriptExecutor</p> Signup and view all the answers

    What is the purpose of the executeScript method in the JavascriptExecutor interface?

    <p>To execute a piece of JavaScript code</p> Signup and view all the answers

    What is the purpose of the executeAsyncScript method in the JavascriptExecutor interface?

    <p>To execute a piece of asynchronous JavaScript code</p> Signup and view all the answers

    In the example code, what is the purpose of the 'button' WebElement?

    <p>To represent a login button on the web page</p> Signup and view all the answers

    What is the purpose of the 'arguments' parameter in the executeScript method?

    <p>To pass arguments to the JavaScript code being executed</p> Signup and view all the answers

    What is the purpose of the 'script' parameter in the executeScript method?

    <p>To represent the JavaScript code that needs to be executed</p> Signup and view all the answers

    What is the purpose of the executeAsyncScript method compared to the executeScript method?

    <p>To execute JavaScript code asynchronously</p> Signup and view all the answers

    What is the purpose of the js.executeScript('alert('Welcome to Guru99');') statement in the example code?

    <p>To generate an alert window with the message 'Welcome to Guru99'</p> Signup and view all the answers

    What is the purpose of the js.executeScript('return document.domain;') statement in the example code?

    <p>To fetch the domain name of the site</p> Signup and view all the answers

    What is the purpose of the js.executeScript('window.location = 'https://demo.guru99.com/';') statement in the example code?

    <p>To navigate to a different page</p> Signup and view all the answers

    Which method is used when Selenium Webdriver fails to click on any element due to some issue?

    <p>executescript</p> Signup and view all the answers

    What does the executeAsyncScript method do?

    <p>Sends a callback to the server-side Testing suite</p> Signup and view all the answers

    What does the script in Example 1 of executeAsyncScript do?

    <p>Waits for 5 seconds</p> Signup and view all the answers

    What is the purpose of the line 'driver.manage().timeouts().setScriptTimeout(20, TimeUnit.SECONDS);' in Example 1 of executeAsyncScript?

    <p>Sets the script timeout to 20 seconds</p> Signup and view all the answers

    What is the output of the script in Example 1 of executeAsyncScript?

    <p>Successfully displayed the passed time more than 5 seconds</p> Signup and view all the answers

    What does the script in the first example of executing JavaScript based code using Selenium Webdriver do?

    <p>Scrolls down by 600 pixels</p> Signup and view all the answers

    What is the purpose of the line 'js.executeScript("window.scrollBy(0,600)");' in the first example of executing JavaScript based code using Selenium Webdriver?

    <p>Scrolls down by 600 pixels</p> Signup and view all the answers

    What is the output of the script in the first example of executing JavaScript based code using Selenium Webdriver?

    <p>Scrolls down by 600 pixels</p> Signup and view all the answers

    What does the script in the second example of executing JavaScript based code using Selenium Webdriver do?

    <p>Performs a sleep in the browser under test</p> Signup and view all the answers

    What is the purpose of the line 'js.executeAsyncScript("window.setTimeout(arguments[arguments.length - 1], 5000);");' in the second example of executing JavaScript based code using Selenium Webdriver?

    <p>Performs a sleep in the browser under test</p> Signup and view all the answers

    Study Notes

    JavaScriptExecutor in Selenium WebDriver

    • Interface for JavaScript Execution: JavaScriptExecutor is the interface used in Selenium WebDriver to execute JavaScript code.
    • Key Methods: Two primary methods provided by JavaScriptExecutor are:
      • executeScript(String script, Object... args): Executes a JavaScript script.
      • executeAsyncScript(String script, Object... args): Executes JavaScript asynchronously.
    • Use Cases: JavaScriptExecutor is useful for manipulating DOM elements, handling alerts, and performing actions when native Selenium commands fail.
    • Required Package: To use JavaScriptExecutor, import org.openqa.selenium.JavascriptExecutor.

    executeScript Method

    • Functionality: The executeScript method runs a JavaScript function within the context of the current page.
    • Function Type: The script in executeScript runs as a regular JavaScript function.
    • Return Values: The executeScript method can indeed return values to the calling method.

    WebElement Interaction

    • Manipulation Capabilities: JavaScriptExecutor allows actions on web elements like clicking, scrolling, and retrieving attributes.

    Common Locators

    • Used Locators: Selenium WebDriver commonly utilizes locators such as ID, name, class name, tag name, CSS selectors, and XPath.

    Plugin Requirements

    • No Extra Plugins: Using JavaScriptExecutor does not require additional plugins or add-ons.

    executeAsyncScript Method

    • Purpose: The executeAsyncScript method is meant for running scripts that require a callback to signal completion.
    • Comparison with executeScript: Unlike executeScript, which runs synchronously, executeAsyncScript can handle operations that take time to complete.

    Example Code Analysis

    • WebElement 'button': The WebElement 'button' is an interactable element that may be clicked or manipulated.
    • 'arguments' Parameter: In executeScript, the 'arguments' parameter allows passing values from the Java function to JavaScript.
    • 'script' Parameter: The 'script' parameter contains the actual JavaScript to be executed.

    Sample JavaScript Execution

    • Alert Example: js.executeScript('alert('Welcome to Guru99');') creates an alert box with a welcome message.
    • Domain Retrieval: js.executeScript('return document.domain;') fetches the current domain of the page.
    • Page Navigation: js.executeScript('window.location = 'https://demo.guru99.com/';') navigates the browser to a specified URL.

    Handling Click Issues

    • Element Click Workaround: When Selenium WebDriver cannot click an element, using JavaScriptExecutor as a fallback method can resolve the issue.

    Async Script Processing

    • Functionality of executeAsyncScript: This method allows executing scripts that require waiting for an asynchronous operation to finish.
    • Example 1 Use: The script in Example 1 sets a timeout for 20 seconds, which manages the script execution length.
    • Script Output: The output of the script may return specific results based on the execution logic defined within it.

    Scrolling and Timeout Considerations

    • Scrolling Example: js.executeScript("window.scrollBy(0,600)"); scrolls the window down by 600 pixels.
    • Example 2 Async Timeout: js.executeAsyncScript("window.setTimeout(arguments[arguments.length - 1], 5000);"); delays execution and handles asynchronous behavior in the script.

    Outputs of JavaScript Execution

    • Execution Results: Outputs from JavaScript executions depend on the specific commands used in the script, allowing for dynamic interactions with the web page.

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    Description

    Learn how to execute JavaScript code using Selenium Webdriver with the help of JavaScriptExecutor interface. Discover the two methods it provides and enhance your Java programming skills.

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